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三角形數
Author:
李春培
三角形數
GeoGebra
New Resources
找出對稱軸
拼砌四邊形
GeoGebra笔记功能体验课件
兩位數除以一位數（一）
兩組對邊相等的四邊形
Discover Resources
捷徑
黎曼和
塗色練習
等弧對等角
利用海龟来趣味演示三角形三边的关系
Discover Topics
Trapezoid
Linear Programming or Linear Optimization
Plane Figures or Shapes
Polygons
Natural Numbers